/// Copyright (c) 2019 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import Foundation
import UIKit

extension AppState {
  var nextStateButtonLabel: String {
    switch self {
    case .notStarted:
      return "Start"
    case .inProgress:
      return "Pause"
    case .paused:
      return "Resume"
    case .caught:
      return "Try Again"
    case .completed:
      return "Start Over"
    }
  }
}

class StepCountController: UIViewController {

  @IBOutlet weak var stepCountLabel: UILabel!
  @IBOutlet var startButton: UIButton!
  @IBOutlet weak var chaseView: ChaseView!

  init() {
    // this is a cheat to simplify chapter 3, a proper way of getting an instance will be handled in chapter 4
    super.init(nibName: nil, bundle: nil)
    startButton = UIButton()
  }

  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
  }

  override func viewDidLoad() {
    super.viewDidLoad()

    updateButton()
  }

  private func updateButton() {
    let title = AppModel.instance.appState.nextStateButtonLabel
    startButton.setTitle(title, for: .normal)
  }

  @IBAction func startStopPause(_ sender: Any?) {
    AppModel.instance.start()
    
    updateButton()
  }
}
